The formula for lead(IV) oxide is PbO₂.

Here's why:

* Lead is a metal with the symbol Pb.

* (IV) indicates that lead has a +4 oxidation state.

* Oxide refers to oxygen with a -2 oxidation state.

* To balance the charges, we need one lead atom (Pb⁴⁺) and two oxygen atoms (2O²⁻).

Therefore, the formula for plumbic oxide (lead(IV) oxide) is PbO₂.